arch/arm/mm/copypage-feroceon.c:65:6: warning: no previous prototype for 'feroceon_copy_user_highpage'

From: kernel test robot
Date: Fri Aug 19 2022 - 18:51:21 EST

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arch/arm/configs/am200epdkit_defconfig
arch/arm/configs/cm_x300_defconfig
arch/arm/configs/colibri_pxa270_defconfig
arch/arm/configs/colibri_pxa300_defconfig
arch/arm/configs/corgi_defconfig
arch/arm/configs/eseries_pxa_defconfig
arch/arm/configs/ezx_defconfig
arch/arm/configs/h5000_defconfig
arch/arm/configs/imote2_defconfig
arch/arm/configs/lpd270_defconfig
arch/arm/configs/lubbock_defconfig
arch/arm/configs/magician_defconfig
arch/arm/configs/mainstone_defconfig
arch/arm/configs/palmz72_defconfig
arch/arm/configs/pcm027_defconfig
arch/arm/configs/pxa255-idp_defconfig
arch/arm/configs/pxa3xx_defconfig
arch/arm/configs/pxa_defconfig
arch/arm/configs/spitz_defconfig
arch/arm/configs/trizeps4_defconfig
arch/arm/configs/viper_defconfig
arch/arm/configs/xcep_defconfig
arch/arm/configs/zeus_defconfig
arch/arm/mach-pxa/Makefile.boot
arch/arm/mach-pxa/include/mach/uncompress.h
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 50cd95ac46548429e5bba7ca75cc97d11a697947
commit: 250c1a694ff304e5d69e74ab32755eddcc2b8f65 ARM: pxa: convert to multiplatform
date: 3 months ago
config: arm-randconfig-c032-20220820 (https://download.01.org/0day-ci/archive/20220820/202208200632.qCY00XWl-lkp@xxxxxxxxx/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=250c1a694ff304e5d69e74ab32755eddcc2b8f65
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 250c1a694ff304e5d69e74ab32755eddcc2b8f65
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash arch/arm/mach-lpc32xx/ arch/arm/mach-versatile/ arch/arm/mm/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

In file included from include/linux/gfp.h:6,
from include/linux/xarray.h:15,
from include/linux/list_lru.h:14,
from include/linux/fs.h:13,
from include/linux/highmem.h:5,
from arch/arm/mm/copypage-feroceon.c:11:
include/linux/mmzone.h: In function '__nr_to_section':
include/linux/mmzone.h:1404:13: warning: the comparison will always evaluate as 'true' for the address of 'mem_section' will never be NULL [-Waddress]
1404 | if (!mem_section[SECTION_NR_TO_ROOT(nr)])
| ^
include/linux/mmzone.h:1390:27: note: 'mem_section' declared here
1390 | extern struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT];
| ^~~~~~~~~~~
arch/arm/mm/copypage-feroceon.c: At top level:
>> arch/arm/mm/copypage-feroceon.c:65:6: warning: no previous prototype for 'feroceon_copy_user_highpage' [-Wmissing-prototypes]
65 | void feroceon_copy_user_highpage(struct page *to, struct page *from,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
>> arch/arm/mm/copypage-feroceon.c:78:6: warning: no previous prototype for 'feroceon_clear_user_highpage' [-Wmissing-prototypes]
78 | void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
--
In file included from include/linux/topology.h:33,
from include/linux/irq.h:19,
from include/asm-generic/hardirq.h:17,
from arch/arm/include/asm/hardirq.h:10,
from include/linux/hardirq.h:11,
from include/linux/interrupt.h:11,
from include/linux/serial_core.h:13,
from arch/arm/mach-lpc32xx/serial.c:13:
include/linux/mmzone.h: In function '__nr_to_section':
include/linux/mmzone.h:1404:13: warning: the comparison will always evaluate as 'true' for the address of 'mem_section' will never be NULL [-Waddress]
1404 | if (!mem_section[SECTION_NR_TO_ROOT(nr)])
| ^
include/linux/mmzone.h:1390:27: note: 'mem_section' declared here
1390 | extern struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT];
| ^~~~~~~~~~~
arch/arm/mach-lpc32xx/serial.c: At top level:
>> arch/arm/mach-lpc32xx/serial.c:63:6: warning: no previous prototype for 'lpc32xx_loopback_set' [-Wmissing-prototypes]
63 | void lpc32xx_loopback_set(resource_size_t mapbase, int state)
| ^~~~~~~~~~~~~~~~~~~~

vim +/feroceon_copy_user_highpage +65 arch/arm/mm/copypage-feroceon.c

d73e60b7144a86 Russell King 2008-10-31 64
063b0a4207e43a Russell King 2008-10-31 @65 void feroceon_copy_user_highpage(struct page *to, struct page *from,
f00a75c094c340 Russell King 2009-10-05 66 unsigned long vaddr, struct vm_area_struct *vma)
063b0a4207e43a Russell King 2008-10-31 67 {
063b0a4207e43a Russell King 2008-10-31 68 void *kto, *kfrom;
063b0a4207e43a Russell King 2008-10-31 69
5472e862de2bc4 Cong Wang 2011-11-25 70 kto = kmap_atomic(to);
5472e862de2bc4 Cong Wang 2011-11-25 71 kfrom = kmap_atomic(from);
2725898fc9bb21 Russell King 2009-10-05 72 flush_cache_page(vma, vaddr, page_to_pfn(from));
063b0a4207e43a Russell King 2008-10-31 73 feroceon_copy_user_page(kto, kfrom);
5472e862de2bc4 Cong Wang 2011-11-25 74 kunmap_atomic(kfrom);
5472e862de2bc4 Cong Wang 2011-11-25 75 kunmap_atomic(kto);
063b0a4207e43a Russell King 2008-10-31 76 }
063b0a4207e43a Russell King 2008-10-31 77
303c6443659bc1 Russell King 2008-10-31 @78 void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr)
d73e60b7144a86 Russell King 2008-10-31 79 {
5472e862de2bc4 Cong Wang 2011-11-25 80 void *ptr, *kaddr = kmap_atomic(page);
43ae286b7d4d8c Nicolas Pitre 2008-11-04 81 asm volatile ("\
43ae286b7d4d8c Nicolas Pitre 2008-11-04 82 mov r1, %2 \n\
d73e60b7144a86 Russell King 2008-10-31 83 mov r2, #0 \n\
d73e60b7144a86 Russell King 2008-10-31 84 mov r3, #0 \n\
d73e60b7144a86 Russell King 2008-10-31 85 mov r4, #0 \n\
d73e60b7144a86 Russell King 2008-10-31 86 mov r5, #0 \n\
d73e60b7144a86 Russell King 2008-10-31 87 mov r6, #0 \n\
d73e60b7144a86 Russell King 2008-10-31 88 mov r7, #0 \n\
d73e60b7144a86 Russell King 2008-10-31 89 mov ip, #0 \n\
d73e60b7144a86 Russell King 2008-10-31 90 mov lr, #0 \n\
303c6443659bc1 Russell King 2008-10-31 91 1: stmia %0, {r2-r7, ip, lr} \n\
d73e60b7144a86 Russell King 2008-10-31 92 subs r1, r1, #1 \n\
303c6443659bc1 Russell King 2008-10-31 93 mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
43ae286b7d4d8c Nicolas Pitre 2008-11-04 94 add %0, %0, #32 \n\
d73e60b7144a86 Russell King 2008-10-31 95 bne 1b \n\
303c6443659bc1 Russell King 2008-10-31 96 mcr p15, 0, r1, c7, c10, 4 @ drain WB"
43ae286b7d4d8c Nicolas Pitre 2008-11-04 97 : "=r" (ptr)
43ae286b7d4d8c Nicolas Pitre 2008-11-04 98 : "0" (kaddr), "I" (PAGE_SIZE / 32)
303c6443659bc1 Russell King 2008-10-31 99 : "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
5472e862de2bc4 Cong Wang 2011-11-25 100 kunmap_atomic(kaddr);
d73e60b7144a86 Russell King 2008-10-31 101 }
d73e60b7144a86 Russell King 2008-10-31 102

:::::: The code at line 65 was first introduced by commit
:::::: 063b0a4207e43acbeff3d4b09f43e750e0212b48 [ARM] copypage: provide our own copy_user_highpage()

:::::: TO: Russell King <rmk@xxxxxxxxxxxxxxxxxxxxxxx>
:::::: CC: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>

--
0-DAY CI Kernel Test Service
https://01.org/lkp

Next message: Dmitrii Bundin: "Re: [PATCH v3] kbuild: add debug level and macro defs options"
Previous message: Mark Brown: "Re: [PATCH] regulator: core: Clean up on enable failure"
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